The number of days of early pregnancy is defined as up to 90 days of pregnancy. Early pregnancy reactions such as nausea, vomiting, dizziness, weakness and drowsiness will occur in early pregnancy, which also varies from person to person, and some people do not have any discomfort in early pregnancy. You must pay attention to rest in the early stage, avoid staying up late and straining, avoid strenuous exercise, and do not have intercourse in the early stage. Early pregnancy should also be timely supplementation of folic acid, which is to prevent malformation of embryonic neural tube development. In early pregnancy, around 40 days, an ultrasound is needed to determine early intrauterine pregnancy. It is dangerous in case of ectopic pregnancy, which can easily lead to rupture hemorrhagic shock and easy hemorrhage. The fetal heartbeat and fetal bud can be seen at 50-60 days of pregnancy. If no fetal heartbeat or fetal bud is seen, consider the case of poor embryonic development.